package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.BooleanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.Result;
import com.hmdp.dto.ScrollResult;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.Blog;
import com.hmdp.entity.User;
import com.hmdp.entity.UserInfo;
import com.hmdp.mapper.BlogMapper;
import com.hmdp.service.IBlogService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.service.IUserService;
import com.hmdp.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ZSetOperations;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

import static com.hmdp.utils.RedisConstants.BLOG_LIKED_KEY;
import static com.hmdp.utils.RedisConstants.FEED_KEY;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class BlogServiceImpl extends ServiceImpl<BlogMapper, Blog> implements IBlogService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private IUserService userService;
@Resource
private IBlogService blogService;
    public Result blogbyid(Long id) {
        Blog blog = getById(id);
        if (blog == null) {
            return Result.fail("笔记不存在");
        }
        queryuser(blog);
        isblogliked(blog);
        return Result.ok(blog);
    }

    private void queryuser(Blog blog) {
        Long userId = blog.getUserId();
        User user = userService.getById(userId);
        blog.setIcon(user.getIcon());
        blog.setName(user.getNickName());
    }

    public Result likeBlog(Long id) {
        Long userId = UserHolder.getUser().getId();
        String key = BLOG_LIKED_KEY + id;
        Double score=stringRedisTemplate.opsForZSet().score(key,userId.toString());
        Blog blog=blogService.getById(id);

//        Boolean isMember = stringRedisTemplate.opsForSet().isMember(key, userId.toString());
        if (score == null) {
            boolean isSuccess = update().setSql("liked = liked + 1").eq("id", id).update();
            if (isSuccess) {
                stringRedisTemplate.opsForZSet().add(key, userId.toString(),System.currentTimeMillis());
            }
        } else {
            boolean isSuccess = update().setSql("liked = liked - 1").eq("id", id).update();
            if (isSuccess) {
                stringRedisTemplate.opsForZSet().remove(key, userId.toString());

            }
        }
        isblogliked(blog);
        return Result.ok(blog);
    }
    private Blog isblogliked(Blog blog){
        UserDTO userDTO=UserHolder.getUser();
        if(userDTO == null){
            return null;
        }
        Long userId=userDTO.getId();
        String key="blog:liked:"+blog.getId();
        Double score=stringRedisTemplate.opsForZSet().score(key,userId.toString());
        blog.setIsLike(score!=null);
        return blog;

    }
   public Result queryBlogLikes(Long id){
        String key=BLOG_LIKED_KEY+id;
       Set<String> top5=stringRedisTemplate.opsForZSet().range(key,0,4);
       if(top5 == null || top5.isEmpty()){
           return Result.ok(Collections.emptyList());
       }
       // 2.解析出其中的用户id
       List<Long> ids=top5.stream().map(Long::valueOf).collect(Collectors.toList());
       System.out.println(ids);
       // 3.根据用户id查询用户 WHERE id IN ( 5 , 1 ) ORDER BY FIELD(id, 5, 1)
       List<UserDTO> userDTOS=userService.query().in("id",ids).last("ORDER BY FIELD(id,\" + idStr + \")")
               .list().stream().map(user -> BeanUtil.copyProperties(user,UserDTO.class))
               .collect(Collectors.toList());
       return Result.ok(userDTOS);

   }
   public  Result queryBlogofFollow(Long max, Integer offset){
        Long userId=UserHolder.getUser().getId();
        String key=FEED_KEY+userId;
        Set<ZSetOperations.TypedTuple<String>> typedTuples=stringRedisTemplate.opsForZSet().reverseRangeByScoreWithScores(key,0,max,offset,2);
       System.out.println(typedTuples+"typedTuples");
        if(typedTuples == null || typedTuples.isEmpty()){
            return Result.ok();
        }
        List<Long> ids=new ArrayList<>(typedTuples.size());
        long minTime=0;
        int os=1;
        for (ZSetOperations.TypedTuple<String> tuple:typedTuples){
            ids.add(Long.valueOf(tuple.getValue()));
            long time=tuple.getScore().longValue();
            if(time==minTime){
                os++;
            }else {
                minTime=time;
                os=1;
            }
        }
        os=minTime==max?os:os+offset;
        String idStr= StrUtil.join(",",ids);
        List<Blog> blogs=query().in("id",ids).last("ORDER BY FIELD(id,"+idStr+")").list();
        for (Blog blog:blogs){
            queryuser(blog);
            isblogliked(blog);
        }
       ScrollResult r=new ScrollResult();
        r.setList(blogs);
        r.setOffset(os);
        r.setMinTime(minTime);
        return Result.ok(r);

   }
}
